[Android] Switch to DeviceUtils versions of GetPid, TakeScreenshot, and GetIoStats.

build/android/pylib/forwarder.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # pylint: disable=W0212
 
 import fcntl
 import logging
 import os
 import psutil
@@ skipping 323 matching lines @@
     cmd = '%s %s --kill-server' % (tool.GetUtilWrapper(),
                                    Forwarder._DEVICE_FORWARDER_PATH)
     device.old_interface.GetAndroidToolStatusAndOutput(
         cmd, lib_path=Forwarder._DEVICE_FORWARDER_FOLDER)
 
     # TODO(pliard): Remove the following call to KillAllBlocking() when we are
     # sure that the old version of device_forwarder (not supporting
     # 'kill-server') is not running on the bots anymore.
     timeout_sec = 5
     try:
-      device.KillAll(
-          'device_forwarder', blocking=True, timeout=timeout_sec)
+      device.KillAll('device_forwarder', blocking=True, timeout=timeout_sec)
     except device_errors.CommandFailedError:
-      pids = device.old_interface.ExtractPid('device_forwarder')
-      if pids:
+      if device.GetPids('device_forwarder'):
         raise